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  <title>获取任意进程的优先级</title>
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  <div id="layout-content"><div id="function.pcntl-getpriority" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">pcntl_getpriority</h1>
  <p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pcntl_getpriority</span> &mdash; <span class="dc-title">获取任意进程的优先级</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.pcntl-getpriority-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>pcntl_getpriority</strong></span>
    ([ <span class="methodparam"><span class="type">int</span> <code class="parameter">$pid</code><span class="initializer"> = getmypid()</span></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$process_identifier</code><span class="initializer"> = PRIO_PROCESS</span></span>
  ]] ) : <span class="type">int</span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>pcntl_getpriority()</strong></span> 获取进程号为
   <code class="parameter">pid</code>的进程的优先级。由于不同的系统类型以及内核版本下
   优先级可能不同，因此请参考您系统的getpriority（2）手册以获取详细的规范。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.pcntl-getpriority-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">pid</code></dt>

     <dd>

      <p class="para">
       如果没有指定，默认是当前进程的进程号。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">process_identifier</code></dt>

     <dd>

      <p class="para">
       <strong><code>PRIO_PGRP</code></strong>（译注：获取进程组优先级）, <strong><code>PRIO_USER</code></strong>
       （译注：获取用户进程优先级）或 <strong><code>PRIO_PROCESS（译注：默认值;获取进程优先级）</code></strong>三者之一。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.pcntl-getpriority-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   <span class="function"><strong>pcntl_getpriority()</strong></span> 返回进程的优先级或在错误时返回 <strong><code>FALSE</code></strong> 。 值越小代表优先级越高。
  </p>
  <div class="warning"><strong class="warning">Warning</strong><p class="simpara">此函数可能返回布尔值
<strong><code>FALSE</code></strong>，但也可能返回等同于 <strong><code>FALSE</code></strong> 的非布尔值。请阅读 <a href="language.types.boolean.html" class="link">布尔类型</a>章节以获取更多信息。应使用
<a href="language.operators.comparison.html" class="link">===
运算符</a>来测试此函数的返回值。</p></div>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.pcntl-getpriority-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="pcntl_setpriority.html" class="function" rel="rdfs-seeAlso">pcntl_setpriority()</a> - 修改任意进程的优先级</span></li>
   </ul>
  </p>
 </div>


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